1. Which of the following represent
a chemical change?
I. Magnetisation of iron
II. Condensation of liquid
III. Burning of fuel
IV. Rusting of iron
Codes
(a) I and
(c) and IV
(b) Il and lI
(d) and IV
2. Which of the following processes related to chemical change?
I. Movement of free electrons in copper wire.
II. Electric current passes through copper wire.
III. Electric current passes through NaCl aqueous solution.
Codes
(a) Iand II
(b) Il and Ill
(c) Iapd ll
(d) III only
3. Which of the following processes responsible for chemical change?
I. Electrolysis II. Sublimation
III. Corrosion IV. Decomposition
Codes
(a) l and I
(b) ll andll
(c) III and IV
(d) I,Ill and IV
4. Which of the following changes are chemical changes?
I. Burning of candle
II. Breaking of chalk
III. Melting of wax
IV. Formation of water from hydrogen and oxygen.
Codes
(a) I and Il
(c) Ill and IV
(b) Il and II
(d) I and IV
Previous Years' Questions
Directions (Q. Nos. 26-27) Following questions consist of two statements, I
and II. Examine these two statements
and select the correct choice according to the codes given below.
(a) Both the statements are true and Statement ll is the Correct
explanation of Statement I.
(b) Both the statements are true but
Statement lI is not the correct explanation of Statement I.
(c) Statement is true, but Statement l is false.
(d) Statement I is false, but Statement l is true.
6. Statement I Conversion of blue copper sulphate to black cupric Oxide on heating is a physical change.
Statement II A change in which
chemical composition does not
change is called physical change.
7. Statement I The bule colour of copper sulphate crystal disappears when it is heated strongly.
Statement II Due to heating water 💧of crystallisation of crystal is lost.
8. Which one among the following is
not a chemical change? 2013 ()
(a) Curding of milk
(b) Ripening of fruits
(c) Evaporation of water
(d) Burning of coal
9. A sample of carbon dioxide that
undergoes a transformation from
solid to liquid and then to gas
would undergo
(a) a change in mass
(b) a change in density
(c) a change in composition
(d) no change in physical properties
10. Which one of the following is not a
chemical change?
(a) Ripening of fruits
(b) Curdling of milk
(c) Freezing of water
(d) Digestion of food
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